View Code of Problem 71

# include<stdio.h>
int main(void)
{
  float a = 2,b = 1,sum = 0,t;
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;++i)
  {
   sum = sum + a/b;
    t = a;
    a = a+b;
    b = t;
  }
  printf("%.2f",sum);
}